When I'm half asleep I don't remember things. Like if someone calls me I'll answer everything "Yeah, okay" form what I am told. I won't remember it either. I also do that with texting too. I fell asleep talking to one of mmy exs before and I guess I told her I was going to pick her up from work the next day and I did not remember saying it. We normally picked each other up from work anyway though but she got mad because I was "late" picking her up even though she had a car and could have just went home.